30-35 years 30s 4 40-45 years 40s adult American associates background board bright business businessman businesspeople casual Caucasian cheerful co work collaboration collar colleagues color computer cooperating cooperation coworkers crew day desk discussing drawing European explaining face female four fourties good mood group happiness horizontal image indoor indoors keyboard life light make male man markerboard mature mid adult mid-adult middle-aged note notepad office people person photo room sit sitting smile staff stockphoto table take talking team teamwork teamworking thirties together typing using white whiteboard woman work worker workers working workplace write writing young